Filtering apparatus



R. E. LANGSTON. FILTERING APPARATUS. APPLICATION FILED JULY 15, I920.

2 SHEETS-SHEET l- INVENTOR.

Patented Feb. 28, 1922.

R. E. LANGSTON.

FILTERING APPARATUS. APPLICATION FILED JULY 15.1920.

Patented Feb. 28, 1922.

2 SHEETS-SHEET 2- INVEN TOR.

ATTO HEY.

UNITED STATES PATENT OFFICE.

ROBERT E. LANGSTON,

013 FORT WAYNE, INDIANA, ASSIGNOR. TO WAYNE OIL TANK AND PUMP COMPANY,OF FORT WAYNE, INDIANA, A CORPORATION OF INDIANA.

FILTERING APPARATUS.

Application filed July 15,

T all whom it may concern:

Be it known that 1, ROBERT E. LANss'roN, a citizen of the United States,residing at Fort Wayne, in the county of Allen and State of Indiana,have invented new and useful Improvements in Filtering Apparatus, ofwhich the following is a specification. My invention relates toapparatus for filtering liquids, such as oil and the like, and theobject of my invention is to provide a highly efficient, simple andcompact apparatus, with a filter cloth readily removable for cleaning.All the dirt is caught on the inside of the filter units and will all beon the outside of the filter'cloth when it is removed from itssupporting cylinders.

Liquids may be relieved of impurities, consisting of solid matter, ifstrained through a filtering material of sufficient density; but

ered ineflicient by the the voids of the filtering material. It istherefore desirable to avoid folds and wrinkles in the filter cloth,hence I have used a tapering, tubular cloth filtering material In theparticular .embodiment of my invention selected for illustration Figure1, is a vertical axial section of one ofthe filter strainer units,showing the relative position of the filter cloth andsupportingrcylinders, when assembled ready for use.

ig. 2, a detail, is a perspective of a filter basket and nest ofsupporting cylinders, with the innermost of these cylinders raised andthe filter cloth ready for the operator to begin its removal. v

Fig. 3, is the tubular filter cloth.

Referring now units contalned in the receptacle closed in a leak tightcasing cover 0 When the dirty liquid enters the filter strainer unitreceptacle B, it flows upwardly through the pipe 6. The pipe I), isprovided with an enlarged attachment 79 at its upper end, within whichis a poppet valve Z2 with a spring .9, adapted to tend to keep saidvalve normally seated. This valve is provided on its outer side with anaxial projection N, which is adapted to press against a simllarprojection 9 of another valve 9 closlng 1n the opposite direction, ashereinafter described. I

The valve seat 6 of the poppet valve 6 is formed by an inwardlyextending periph- B, are en- C, with a Specification of Letters Patent.

many straining operations in filters are rendlack of uniformity of thedrawings, the filter Patented Feb. 28, 1922. 1920. Serial No. 396,570.

This hollow boss contains a poppet valveg wlth spring s and an outwardlyextendlng axial PI'OJBCGIOII 9 whose end is adapted to bear agalnst theend of the projection b as heretofore described. The valve seat 9,

0f the poppet valve 9 is formed in the cupped end g, of the hollow boss9 When this filter strainer apparatus is in position, as shown ln'Figurel of the drawings, both of these poppet valves are held open, and thel1qu1d to be filtered is allowed to flow freely through the pipe 6, pastboth valves b 9 1nto the chamber formed by the perforated or wire basketG, and its cover Gr.

Wlthin this perforated or wirebasket G, are a plurality of concentricscreen cylinders 93 9", y, 9, 9*, 9*, 9 9 ,9 9 9" and g A conical tube9", of suitable filter cloth,

long enough to pass downwardly over the core 9, of the supportingbasket, and between it and the screen cylinder 9 and then upwardly overthe outside=of the cylinder 9'; thence downwardly over the outside ofcylinder g upwardly over the outside of cylinder g and so on, turningthe cloth over the outside of the next larger cylinder, in the orderthey come, until the cloth tube is passed upwardly between the outsideof cylinder g and the inside of the perforated or wire basket G.

The small end of the tapered tube 9 is held firmly into its place by ametal band g pressing over the tube and holding it against the outsideof the basket g.

The large end of the tapered tube 9", is held firmly to its place by ametal band 9 pressing against the inside of the tube 9, and holding itagainst the inside of the basketwall Gr. These bands together with thebasket cover G seal both ends of the tube and make it impossible for anyliquid to pass from one side of the cloth to the other except by passingthrough the tapered tubular filter cloth g". r

The strainer unit receptacle B, is leaktight on the bottom and sides andis open on the top. It is large enough to contain a complete filterstrainer unit and is filled to the level of its outlet pipe 9 with cleanoil, which completely covers the filter strainer. The purified oil afterpassing from the filter strainer pours out of receptacle B, into theclean oil stora e compartment formed by the casing C, MM? is now readyfor re-use.

By this construction and arrangement of the filter strainer, the maximumarea of filter medium is provided within a given space; the area of themedium is supported in a vertical position so that the slime, sedimentor impurities caught from the oil tend to work downward] therefrom,thereby making the filter me ium to a great degree, self cleaning. Thedifference between the inside and the outside pressures on the filtercloth St due to the head of the liquid above the outlet g of thereceptacle B, containing the filter strainer is the same over the entirearea of the cloth. The filter cloth is shaped and supported in such amanner that it is free from folds and gathers and because of these twofacts is uniformly effective. The liquid is passed from the inside ofthe unit to the outside, whereby the dirt is all-retained in the unitand not'allowed to fall back into the oil again.

A filter strainer unit may be removed from its receptacle B, when itsfiltering action becomes sluggish and carried to any convenient placefor cleaning. The removal of a filter strainerunit is accomplished bylifting it upwardly by the axial projection 9 on poppet valve 9 islifted from its contact with the axial projection b, on poppet valve 6spring 8 acting on poppet valve seats it against the valve seat (7 andcloses the valve against any back flow of the dirty oil. Sprmg s, actingon valve b seats it upon the seat 6 and closes this valve against anyfurther feed of the dirty oil, while the filter unit is not in itsreceptacle.

The filter cloth is removed from the basket and supporting screencylinders of the filter strainer unit to be cleaned, by pulling upwardlyon the small end of the telescoped cloth tube and thus extending it. Thedirt will all be found on the outside surface of the tube, where itshould be for cleaning. As the telescoped cloth tube is extended it isrolled into a bundle and athered into the hand of the operator, untilthe entire tube is free from its supporting cylinders and basket. It isthen found'rolled up in one hand of the operator with the dirt on theoutside. The tube is now in its easiest possible shape for washing andthe mussy conditions incidental to handling other types of dirty filtercloths are eliminated. Much less time is required to remove a dirtycloth of equal area than in any other type of filter.

The 0 eration of the apparatus is as follows he liquid to be purifiedpasses upwardly through the pipe b, passes the open the handle 9. As

valves b through the hollow boss 9 and into the open space between thetop of the Screen cylinders 9*, 9 9 9 9 9, W a

g", g, g, 9 g and the cover Ge into the spaces between the severalconcentric folds of the filter cloth "g", allowing the liquid to passthrough the filter cloth where it deposits practically all of itsremaining impurities and out through the perforated or wire basket G,into the body of cleaned liquid maintained in the receptacle B, whenceit flows through the outlet pipe 9 into the clean oil storage.

I claim as my invention and desire to secure by Letters Patent of theUnited ates. 1. In an apparatus for purifying and filtering oils, afilter strainer compartment, a

removable filter strainer unit therein; means weight of the unit, atapering filter cloth tube within said unit, a plurality of concentricperforated cylinders in said unit between which the concentric folds ofsaid tube are supported in such a manner as to cause the oil enteringthe unit to pass throu h the cloth from within the nest of cylimfiersoutwardly, and means for keepin the filter strainer unit immersed infiltere oil. r

2. In an ap aratus for purifying and filtering oil, a lter strainercompartment, a removable filter strainer unit in said compartmentconsisting of a liquid tight cup shaped receptacle, a vertical pipe tocarry the oil to be treated to the unit extending axially up into saidreceptacle, a valve in said pipe adapted to prevent oil flowing throughand out of said pipe except when pressure is exerted from above on saidvalve, a erforated basket with an axial inlet pipe a apted to co-actwith said vertical pipe, a ,valve in said inlet pipe adapted to preventa back flow of oil except when opened by pressure from beneath, said twovalves adapted to maintain each other in open position by the weight ofthe perforated basket a plurality of perforated cylinders in sai basket,a tapermg filter cloth tube so disposed between said erforated cylindersas to allow the oil to fi ter therethrough from filter cloth supportscomprising a perforated basket with a downwardly extendin axial inletpipe, a valve in sai downwar 1y extendin inlet pipe adapted to prevent aback flow 0 oil except when held open by pressure from below, said twovalves adapted to maintain each other in open position by the Weight ofthe removable nest of filter cloth supports when the same are inposition for use, said two supply pipes adapted to form a continuous oilpassage when said valves co-act, a plurality of concentric perforatedcylinders in said basket, a tapering filter cloth tube so disposedbetween each two of said perforated cylinders as to allow the oil tofilter therethrough from within 15 the nest outwardly into thereceptacle; and an outlet for the filtered oil from near the top of thereceptacle.

n testimony whereof I have hereunto set my hand in presence of twosubscribing wit- 20 nesses.

ROBERT E. LANGSTON.

Witnesses LAWRENCE H. PARROT, JUSTIN M, KIJNGENBERGER.

